  class StudentBZ extends Student{
    private String duty;
    public StudentBZ(String id,String name,double Englishiscore,double Mathscore,double Computerscore,String duty){
        super(id,name,Englishiscore,Mathscore,Computerscore);
        this.duty=duty;
    }
    public double testscore(){
        return super.testscore()+5;
    }
    public String toString(){
        return super.toString()+"duty"+duty;
    }
}
